#include<bits/stdc++.h> 
using namespace std;
int main() {  
    int a,b,c;
    cin>>a>>b>>c;
    if(a>b) swap(a,b);
    if(b>c) swap(b,c);
    if(a>c) swap(a,c);
    if(a+b<c) {
       cout<<"Not triangle";
       return 0;
	}
    if(a*a+b*b==c*c) cout<<"Right triangle"<<endl;
    if(a*a+b*b>c*c) cout<<"Acute triangle"<<endl;
    if(a*a+b*b<c*c) cout<<"Obtuse triangle"<<endl;
    if(a==c||b==c||a==b) cout<<"Isosceles triangle"<<endl;
    if(a==b&&b==c) cout<<"Equilateral triangle"<<endl;
    return 0;
}

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